{"action":"opened","issue":{"url":"https://api.github.com/repos/casacore/casacore/issues/677","repository_url":"https://api.github.com/repos/casacore/casacore","labels_url":"https://api.github.com/repos/casacore/casacore/issues/677/labels{/name}","comments_url":"https://api.github.com/repos/casacore/casacore/issues/677/comments","events_url":"https://api.github.com/repos/casacore/casacore/issues/677/events","html_url":"https://github.com/casacore/casacore/issues/677","id":279500496,"number":677,"title":"Slow real and imag extract from Complex when reading MS file.","user":{"login":"miguelcarcamov","id":5432126,"avatar_url":"https://avatars0.githubusercontent.com/u/5432126?v=4","gravatar_id":"","url":"https://api.github.com/users/miguelcarcamov","html_url":"https://github.com/miguelcarcamov","followers_url":"https://api.github.com/users/miguelcarcamov/followers","following_url":"https://api.github.com/users/miguelcarcamov/following{/other_user}","gists_url":"https://api.github.com/users/miguelcarcamov/gists{/gist_id}","starred_url":"https://api.github.com/users/miguelcarcamov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/miguelcarcamov/subscriptions","organizations_url":"https://api.github.com/users/miguelcarcamov/orgs","repos_url":"https://api.github.com/users/miguelcarcamov/repos","events_url":"https://api.github.com/users/miguelcarcamov/events{/privacy}","received_events_url":"https://api.github.com/users/miguelcarcamov/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-12-05T19:29:17Z","updated_at":"2017-12-05T19:29:17Z","closed_at":null,"author_association":"NONE","body":"Hello there, \r\nI'm using casacore to read/write an MS File to use the data for image synthesis.\r\n\r\nWe have a problem extracting the real and imaginary parts of the data. We have found that the process of extraction of floating point precision complex data is slow.\r\n\r\nWe have programmed a routine to read the MS File. You can see it on the function readMS on https://github.com/miguelcarcamov/gpuvmem/blob/master/src/MSFITSIO.cu\r\n\r\nWe have found that lines v = casa::real(dataCol[j][sto]); and v = casa::imag(dataCol[j][sto]); are the ones which slow down the program. This essentially when the MS File has a big number of channels (frequencies).\r\n\r\nDo you know how to accelerate the reading process of those functions? Do you have a read/write MS routine (that I don't know) implemented on casacore?\r\n\r\nBest regards."}}
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